Are you asking about phase change material in the context of thermal storage media, or in terms of building envelope constructions?

A construction/layer/material that can change properties of thermal mass and conductivity each interval based on present/prior interval conditions is not something that I understand can be accomplished within the framework of doe2.2/doe2.3. I understand there was a feature called FUNCTIONS that allowed users to set up something of this nature in doe2.1, but that was before my time practicing energy modeling.

That said, I believe energyplus has a PCM module that permits dynamic material properties by way of applied temperature curves. I have not personally dabbled in this area but if I were compelled/required to pursue an analysis of this nature I think you might find platforms using the energyplus engine may have something you can use more directly.

Hope this helps!

~Nick

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Nick Caton, P.E. (US), BEMP
??? ????, P.E. (US), BEMP
Senior Energy Engineer
Energy Manager, Yokota Airbase
ESS - Energy & Sustainability Services
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+81 . 070 . 3366 . 3317
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